I've not had dried-our chicken pieces since I was given a good food thermometer as a present. Whatever temperature you cook it at - for a fast or slow cook - the inside has to be at 74 degrees C. That is usually sooner than you expect, so most chicken gets over-cooked and dry. The Christmas after the one when I was given it, I bought three as gifts. Each of the recipients has said since that at first they thought "A nice gadget, but it won't get much use!" but has found it absolutely indispensible.
(PS the make of my thermometer is Superfast Thermal Pen 3 - and no, I don't get any commission for mentioning it.)